Question about 1995 Chevrolet C/K 3500

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Front axle will not engage, transfer case is working fine. I was told the accuator was probably the problem. There is another sensor right above it and I don't know what it is?

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  • djc396 Dec 12, 2009

    it did nothing, that was my first attempt to solve it



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There is a relay mounted on the firewall in the center of the engine compartment. On Borg Warner transfer cases it gives the front axle actuator signal to engage and then light the 4x4 indicator light. It was tricky but I would try this before throwing an actuator at it.

Posted on Feb 10, 2011

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Try this OLD trick.

Next time you go off road, after you made the selector to 4X4 HIGH.

SLOWLY drive backward for 6 to 12 feet.

See does the front axle engage.

Test 4X4 low.

Please give this a shot and let me know the result on the comment window.

Posted on Dec 12, 2009


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Hello tmaxx31190
Start by checking fuse #7 a 15amp fuse in the fuse block under the left side of the dash. This fuse is for the accuator motor on top of the left front axel tube. The accuator moter engages and
disengages the front axel for 4wd and 2wd. If the fuse is good, have someone operate the switch
and check to see if the accuator is working, you should be able to hear it engage or disengage.
If it's not working check the connections and for power at the accuator before possibly changing it.
If the accuator is working, it could be a problem with the shift fork inside the differential. Also, have
someone start the truck and engage the 4x4 then look to be sure the output shaft from transfer case to the front axel is turning. The safest way to do this is to have all 4 wheels up on jack stands.
Hope this is helpful.

Feb 10, 2011 | 2002 GMC Sierra

1 Answer

The Smart Trac AWD is not turning the front wheels. Had it check by mechanic and the drivetrain is spinning but not engaging the front axles. Accuator? or other ideas?

Did you change your transfer case fluid every 50K miles? Very important requirement in the Owner's Manual. And how are the TC and differential fluid levels today? If all this its ok, them sound like the AWD vehicles like yours will need a dealer reprogram if the TCCM came off a 4WD vehicle.

Keep in mind that the part-time 4WD systems like I have (with 4LO as an option in the transfer case) have a front axle disconnect actuator plus the transfer case. But full-time AWD systems like you have use the transfer case only to send or not send torque to the front axle. You don't have a front axle actuator.

If the technician was using the tech tool to talk to the transfer case (not the front axle), then the TC (Transfer Case) could have an internal problem, or the Transfer Case encoder motor could have a problem, or the Control Module. You should definitely try spinning the front driveshaft by hand and see if the front wheels move.

Keep us updated.

Feb 03, 2011 | 2002 Oldsmobile Bravada

1 Answer

Something is wrong with the 4WD. Will engage in neutral to 4WD Lo which means the vaccum is probably working but 4WD Hi will not engage. I have tried resetting the control module as described in the owners...

what you are most likely feeling is in 4lo the transfer case drops the gear ratio and 4hi just locks the front differential in. do you know if the front axle is locking in in 4lo? i suspect you have a vacuum issue to the front actuator and this is why. there is a vacuum switch on top of transfer case that will stick and cause problems and sometimes the vacuum lines will pop off of this switch.check and see if you are getting vacuum to the actuator if not follow lines be sure one is not broken if you are then actuator is bad

Dec 30, 2010 | 1994 Chevrolet S-10 Blazer

1 Answer

The 4 wheel drive does not work the transfer case engages but not the front diff any suggestions

check accuator and wiring and fuse for 4x4.wiring also goes from axle to tranfer case

Dec 23, 2010 | 1988 GMC K3500

1 Answer

4wd will not engage on my 2001 gmc jimmy

Try listening to the transfer case try to engage.The vacuum actuater on the firewall above the distributor was not allowing vacuum to the front axle actator. You can put the truck on jackstands (all 4 wheels) and check to see if the front drive shaft engages. If so, then it's probably the vacuum actuator or the axle actuator.

Dec 23, 2010 | 2001 GMC Jimmy

1 Answer

91 s-10 wont go into 4 wd at transfer case i want to mannually engage transfer case

if you engage the 4wd in the cab and it doesnt engage, but you can move the arm at the front axle and then it does engage, you probably have a vacuum leak causing the actuator to not work. That model truck was bad about that. There is now an aftermarket kit you can install that works manually from inside the cab to engage/disengage the front axle.

Sep 23, 2009 | 1991 Chevrolet S-10 Blazer

1 Answer

4x4 not working when i shift it in 4x4 auto trans

Find the accuator on the front axle it has a two wire pigtail and threads into the axle housing. Check for power and ground if you have both when the transfer case is in 4x4 the replace the accuator. They are available at most parts stores and are a very common problem. Let me know how it goes.

Dec 16, 2008 | 1989 Chevrolet C/K 2500

1 Answer

4x4 on a 2001 s10

when the transfer case shifts into 4wd it activates a vaccum switch on the transfer case which sends vaccum to the accuator for the front axle. the accuator pulls a cable that locks in the axle. the switch on the transfer case is a well known problem. check for vaccum in and out of this switch in 4wd. if you have vaccum out then check the accuator under the battery. If the vaccum switch on the transfer case is bad you can find one at most parts store in the HELP section #49315. please rate if this helps

Nov 22, 2008 | 2001 Chevrolet S-10

2 Answers

1990 jeep wrangler front driveline engages but tires dont.

check you vacuum motor and vacuum lines going to the vacuum motor from the top of the transfer case. when u engage your 4WD the valves on the transfer case are opened by a switch on the transfer case. the lines coming from the switch cross the top of the transmission and up the passenger side of the engine compartment. these lines will be red, blue, green and yellow, and often covered by a black sheeth, about 1inch in diameter. check these lines to make sure they are connected. if they are not, the vacuum motor will not engage your front axle. your front driveshaft will still spin, because the transfer case is engaged as normal, but the right front axleshaft is a 2 piece system engaged by this vacuum motor. if they lines are messed up, the motor will not engage the axle collar connecting the 2-piece axle. if your vacuum motor is working, then you might have a broken collar, or perhaps a broken axle shaft. but it's probably just the vacuum hoses or the motor :) i hope that helps!

Nov 15, 2008 | 1990 Jeep Wrangler

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